problem with adding rolling friction

Submitted by naren on Thu, 11/27/2014 - 10:41

Hi All,

When i am using rolling friction in my model, it is giving the following error;

ERROR: Fix wall/gran (id geometry): Unknown argument or wrong keyword order: 'rolling_friction' (../fix_wall_gran_base.h:96)

I have used the following statement in my input script

fix geometry all wall/gran model hertz tangential history mesh n_meshes 3 meshes cad1 cad2 cad3 rolling_friction cdt

Without rolling friction my script is working fine.

Any help will be much appreciated.

Thanks,

Narendra

Forums:

JoshuaP | Thu, 11/27/2014 - 10:51

try to put it after tangential history like this:
fix geometry all wall/gran model hertz tangential history rolling_friction cdt mesh n_meshes 3 meshes cad1 cad2 cad3

btw I would prefer the epsd or epsd2

Daniel Queteschiner | Thu, 11/27/2014 - 10:54

If I remember correctly, it should be

fix geometry all wall/gran model hertz tangential history rolling_friction cdt mesh n_meshes 3 meshes cad1 cad2 cad3

see liggghts_3.X_tutorial.html in the doc folder for details

naren | Thu, 11/27/2014 - 11:49

Thanks Joshuap and Daniel. It is working fine now. I have to read about epsd and epsd2.

Regards,
Narendra

Sureka | Tue, 10/30/2018 - 13:35

Hi All,

I am encountering the following error when I tried running my model

ERROR: Unknown argument or wrong keyword order: '2000.0'

the following is my input script

pair_style gran model hooke tangential history 2000.0 NULL 50.0 NULL 0.5 0

Need help in resolving it

Thanks,

Sureka

Daniel Queteschiner | Tue, 10/30/2018 - 15:23

I don't see any options for the pair_style command that would take values of that kind (and LIGGGHTS doesn't find any either, as the error message suggests ...).
2000.0 NULL 50.0 NULL 0.5 0
What are those numbers supposed to specify? What do you intend to do there?